Since the birth of the expanded DC TV Universe in Arrow season 2, the crossovers between super-colleagues on The CW have become an annual tradition. This time around, however, the network’s elder statesmen (i.e., Arrow and The Flash) won’t be doing the heavy lifting with regard to setting up the event, as the crossover in question doesn’t have to play double-duty and function as the setup for an entirely new series. With Supergirl having already established itself and Kara Zor-El with a successful first season on CBS, the Arrowverse can welcome Superman’s cousin as a fully established character in her own right, one who comes complete with supporting cast, fictional hometown in need of a plucky hero, and a pre-existing relationship (entirely platonic, of course) with The Flash.

Following the hub-bub of Comic-Con, the casts of The CW’s DC Comics shows were willing to share what details they could about the upcoming four-night crossover event that will unite the network’s heroes against a common threat, but concrete details have remained scarce. That hasn’t stopped certain actors from taking to social media to help spread the word and to get audiences excited for the biggest superhero event on TV so far.

Recently, Stephen Amell took to Twitter with an image that strongly suggests the casts of Arrow, The Flash, Legends of Tomorrow, and Supergirl have banded together for the first time to begin work on the much ballyhooed crossover. Although Amell offered nothing in the way of context for his post, certain visual clues imply that the gang’s all here and the crossover is about to be committed to celluloid – or some massive hard drive somewhere.

As you can see, the image definitely has a “boots on the ground” feel to it, as it shows what looks to be Green Arrow, Supergirl, White Canary, The Flash, and Atom hanging around backstage waiting to be called to action. The image definitely has a low-key hangout vibe going for it, so either Amell captured a candid moment before a photo shoot or there’s some setup being done between shots on set. While there’s little chance that the four-evening crossover event will consist of a bunch of heroes gathering together to enjoy one another’s company and maybe all go in on some endless appetizers at TGI Fridays, we can dare to dream that there will at least be a subplot in which Supergirl and The Flash race to see who gets the last Loaded Potato Skin.

While it’s definitely not an official announcement by any means, the image does raise some interesting questions with regard to what The CW has planned for the week of superhero team ups. Will the event be the catalyst that brings Supergirl into the fold of the established Arrowverse or will that happen on her own show? And what role if any does Flashpoint play in both her becoming a part of the network’s universe and the event itself? Given what’s been said about both — the “unifying threat” and the fact that Flashpoint won’t last all season — the occasion seems like the best chance the series have at making proper introductions and welcoming Kara Danvers to The CW and its successful Arrowverse.

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The Flash season 3 will premiere Tuesday October 4th at 8pm on The CW, Arrow season 5 will premiere in the same timeslot on Wednesday October 5th, Supergirl season 2 on Monday October 10th, and Legends of Tomorrow season 2 on Thursday October 13th.